/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraParameterDefinitionsSubscriberViewModel.h
Public passthrough to get theOnChanged()delegate owned by the viewedINiagaraParameterDefinitionsSubscriber.
[FOnSubscribedParameterDefinitionsChanged](API\Plugins\Niagara\FOnSubscribedParameterDefinition-) & GetOnSubscribedParameterDefinitionsChangedDelegate()